We are not meant to be stress free.

I am not going to turn this into a zoo vs the wild and whether or not zoos are good or bad, my point about this is how we, as animals, survive and even thrive in an environment that allows us to be challenged and to adapt to changes.

If you ever see animals in the wild compared to those at zoos the difference is astounding.  We are brought up with the belief that having a safe environment, free of enemies and where we can count on having our meals, medical and housing looked after or at least assured will lead to a stress free life and we will do better.  Hence the zoo.  When I say "we" I refer to all animals including man.  This just is not true.
An animal in the wild looks so much more alive and aware of it's self.  An animal in captivity where it is given everything loses it's self of identity.
This may seem far fetched, but a lot of solid research backs up the point that animals due better mentally and emotionally in the wild.  They have opportunities to become leaders, survivors and even respected group members. 
The other side of the coin to this, which again is not my point, will be the people who say "well you are right, lets cut off all welfare and assistance and put these lazy bums out to work and they will feel better."  Again not my point, even zoos and wildlife sanctuaries recognise that there are species who through no fault of their own other than mans greed and ignorance would face extinction without help.  So again, this is not a political issue of Left vs Right, but the point is we need to have that feeling of striving, working, creating, rising through the ranks if we desire, in order to have a feeling of fulfilment.
So once again, in business or ventures of any type, one will produce greater work and art when doing so in a free environment rather than in a safe, secure cage or cubicle.  The life in the wild might seem a little frightening at first, but that really is our natural habitat.  We are meant out be out there running in the grass and being the best human animal we can be!